I have windows 7 ultimate OS. It was working fine till yesterday, when it started, it started with a new desktop screen and my old desktop screen was gone and it gave the following message in the system tray " You have been logged on with a temporary profile. You can not access your files and files created in this profile will be deleted when you log off and try logged on later. Please see the event log for details or contact your system admin". I tried to log off and log on again, but no changes found. I had not installed any new software or hardware in the recent past. Why this problem came and how to get rid of this problem and get back to my old desktop. Kindly help me.